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Photo: ReutersThe University of Phoenix Stadium home of the Arizona Cardinals.

Arizona Cardinals rookie Robert Gill has stunned fans by running 25 mph on a treadmill in a video that has now gone viral.

Gill is still not a fully proven entity in the NFL, but he has amazed people with his running skills in the gym.

The Cardinals have been happy to give Gill a tryout despite the fact that he is already nearly turning 30, but the treadmill video gone to show some of the skills he has displayed that have impressed Arizona's scouts and coaches to give him a chance.

The Arizona Cardinals will be kicking off their new season on August 9 with a 5 p.m. game against the Green Bay Packers at Green Bay.

Through August they have three other games lined up to open their season, two home games against the Dallas Cowboys and the San Diego Chargers, as well as an on the road game against the Denver Broncos.

Here is the video of Arizona Cardinals rookie Robert Gill running on the treadmill at 25 mph: